feat: integrate sonner for toast notifications and enhance UI feedback

Added the sonner library for toast notifications across various components, improving user feedback for actions such as saving settings, syncing rules, and handling errors. Updated the layout to include a Toaster component for consistent notification display. Refactored alert messages in the backups, gre, and filters pages to utilize the new notification system, enhancing overall user experience.

backend/src/db/schema.ts

@@ -426,6 +426,20 @@ export const schedulerRuns = sqliteTable("scheduler_runs", {
   resultJson:  text("result_json"),
 })
 
+/** Централизованный append-only журнал событий системы. */
+export const events = sqliteTable("events", {
+  id:           text("id").primaryKey(),
+  createdAt:    text("created_at").notNull(),
+  level:        text("level", { enum: ["critical", "warning", "info"] }).notNull(),
+  eventType:    text("event_type").notNull(),
+  sourceModule: text("source_module").notNull(),
+  title:        text("title").notNull(),
+  message:      text("message").notNull(),
+  entityType:   text("entity_type"),
+  entityId:     text("entity_id"),
+  payloadJson:  text("payload_json"),
+})
+
 export const uptimeSpeedTestRuns = sqliteTable("uptime_speed_test_runs", {
   id:                 text("id").primaryKey(),
   probeId:            text("probe_id"),
@@ -468,6 +482,7 @@ export type UptimeResourceSampleRow = typeof uptimeResourceSamples.$inferSelect
 export type UptimeSpeedProbeRow = typeof uptimeSpeedProbes.$inferSelect
 export type UptimeSpeedTestRunRow = typeof uptimeSpeedTestRuns.$inferSelect
 export type SchedulerRunRow = typeof schedulerRuns.$inferSelect
+export type EventRow = typeof events.$inferSelect
 export type EvobgpSettingsRow = typeof evobgpSettings.$inferSelect
 export type AlertTelegramSettingsRow = typeof alertTelegramSettings.$inferSelect
 export type AlertGroupRow = typeof alertGroups.$inferSelect